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+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Chapter 41. Procedural Languages</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /><link rel="prev" href="rules-triggers.html" title="40.7. Rules Versus Triggers" /><link rel="next" href="xplang-install.html" title="41.1. Installing Procedural Languages" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">Chapter 41. Procedural Languages</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="rules-triggers.html" title="40.7. Rules Versus Triggers">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="server-programming.html" title="Part V. Server Programming">Up</a></td><th width="60%" align="center">Part V. Server Programming</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 12.0 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="xplang-install.html" title="41.1. Installing Procedural Languages">Next</a></td></tr></table><hr></hr></div><div class="chapter" id="XPLANG"><div class="titlepage"><div><div><h2 class="title">Chapter 41. Procedural Languages</h2></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="sect1"><a href="xplang-install.html">41.1. Installing Procedural Languages</a></span></dt></dl></div><a id="id-1.8.7.2" class="indexterm"></a><p>
+ <span class="productname">PostgreSQL</span> allows user-defined functions
+ to be written in other languages besides SQL and C. These other
+ languages are generically called <em class="firstterm">procedural
+ languages</em> (<acronym class="acronym">PL</acronym>s). For a function
+ written in a procedural language, the database server has
+ no built-in knowledge about how to interpret the function's source
+ text. Instead, the task is passed to a special handler that knows
+ the details of the language. The handler could either do all the
+ work of parsing, syntax analysis, execution, etc. itself, or it
+ could serve as <span class="quote">“<span class="quote">glue</span>”</span> between
+ <span class="productname">PostgreSQL</span> and an existing implementation
+ of a programming language. The handler itself is a
+ C language function compiled into a shared object and
+ loaded on demand, just like any other C function.
+ </p><p>
+ There are currently four procedural languages available in the
+ standard <span class="productname">PostgreSQL</span> distribution:
+ <span class="application">PL/pgSQL</span> (<a class="xref" href="plpgsql.html" title="Chapter 42. PL/pgSQL - SQL Procedural Language">Chapter 42</a>),
+ <span class="application">PL/Tcl</span> (<a class="xref" href="pltcl.html" title="Chapter 43. PL/Tcl - Tcl Procedural Language">Chapter 43</a>),
+ <span class="application">PL/Perl</span> (<a class="xref" href="plperl.html" title="Chapter 44. PL/Perl - Perl Procedural Language">Chapter 44</a>), and
+ <span class="application">PL/Python</span> (<a class="xref" href="plpython.html" title="Chapter 45. PL/Python - Python Procedural Language">Chapter 45</a>).
+ There are additional procedural languages available that are not
+ included in the core distribution. <a class="xref" href="external-projects.html" title="Appendix H. External Projects">Appendix H</a>
+ has information about finding them. In addition other languages can
+ be defined by users; the basics of developing a new procedural
+ language are covered in <a class="xref" href="plhandler.html" title="Chapter 55. Writing a Procedural Language Handler">Chapter 55</a>.
+ </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="rules-triggers.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="server-programming.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="xplang-install.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">40.7. Rules Versus Triggers </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 41.1. Installing Procedural Languages</td></tr></table></div></body></html> \ No newline at end of file